High-frequency Active Auroral Research Program

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What Wikipedia says

The High-frequency Active Auroral Research Program (HAARP) is a University of Alaska Fairbanks program which researches the ionosphere – the highest, ionized part of Earth's atmosphere.

Excerpt from the Wikipedia article “High-frequency Active Auroral Research Program”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Michael Kleiman, US Air Force, Public domain, via Wikimedia Commons.